LYROPUPA. 251 



It is the only species of the mirabilis group so far reported 

 from the Koolau Mountains. It is abundant in the deposits 

 from the upper portion of the road, but entirely absent from 

 the lower deposits less than half a mile distant. It appears 

 to be rather local, but it may have had a wider extension be- 

 fore the destruction of the lower forest zone. 



11. LYROPUPA HAWAIIENSIS (Ancey). PL 22, figs. 12, 14. 



The shell is sinistral, rimate-perforate, oblong, thick, opaque, 

 in its fossil state brownish, marked with strong transverse, 

 slightly flexuous ribs, 19 to 22 on the last whorl, the interstices 

 minutely flexuously striate, parallel to the ribs. Spire with 

 convex outlines, rapidly tapering above; apex rather obtuse. 

 The individual whorls are rather strongly convex, separ- 

 ated by a rather narrowly impressed suture. Whorls 

 5% to 6, the embryonic 1% nearly smooth, under a 

 strong lens very minutely granulose, the transverse costse ap- 

 pearing abruptly at about the middle of the second whorl. 

 The last whorl has a somewhat flattened base ; furnished with 

 a rather broad shallow sulcus on about the last % of its length, 

 the sulcus ending just behind the expanded peristome. Aper- 

 ture perpendicular, indistinctly triangular in outline, with 

 very rounded corners; peristome continuous, with free mar- 

 gins. Angular lamella short, blunt and low, extending to the 

 margin; parietal strong, very deeply seated, a little curved 

 concentrically, not very long, oblique, its free margin flaring 

 outward. Sometimes there is an indistinct nodular, deeply 

 seated infraparietal present. Columellar lamella short, nodu- 

 lar, high, deeply seated and very obliquely entering; upper 

 palatal fold rather short, low and not emerging to the lip. 

 Lower palatal is somewhat higher and more deeply seated, 

 nearly parallel to the upper, which reaches about to the middle 

 of its length. Basal fold transverse, deeply seated, blunt, 

 Peristome continuous, expanded. Length 2.58, diam. 1.45, 

 apert. 0.95 mm. (fig. 14). 



Hawaii: Palihoukapapa and Mana (Henshaw, Thaanum) ; 

 fossil. Type 18748 Bishop Museum, paratypes 36656 Bishop 

 Museum and 119468 A. N. S. P. Also in Thaaiium and Hen- 

 shaw collections. 



